Hi, James.

I've checked out the sennottorum photos against my
description and photos of the cone originally (Rehder and Abbott's
"Some New and Interesting Mollusks from the Deeper Waters
of the Gulf of Mexico"- as well as my own experiences with the shell
since I still have several of them saved from when I got them
in the early 50s from the Campeche shrimpers and two from the
Sennotts themselves.

I'm no ID expert, but I'd say -this is one. It has the high spire,
and the fusiform shape distinctive of C. sennottorum.  The discussion
in the monograph distinguishes it from C. floridanus (sure doesn't look
like that) and from C. spurius (likewise).  The monograph does
say that the white background is bluish white - that doesn't
come through on you  photograph, but that could could just be
the color reproduction.

Amazing what you can find on a beach or off beach for that matter  -
especially when there's renourishment going on.  That's probably how I
found a typhis by the roadside in John Lloyd State Park last year
and this, right on the beach a perfectly decent Oliva reticularis
bollingi.

I've never heard of a C. sennottorum being found on a beach before,
so that's quite a find !

Karen